Burglar-alarm.



PATENTED JAN. l0, 1905.

0. B. HANSON. BURGLAR ALARM.

APPLIOATION FILED JUNE 18,1904.

UNITED STATES Patented January 10, 1905.

PATENT OFFICE.

BURGLAR-ALARNI.

SPECIFICATION forming part of Letters Patent No. 779,847, dated. January 10, 1905. Application flied June 18, 1904:. Serial No. 213,124.

To @ZZ whom it may concern,.-

Be it known that I, OLE B. HANsoN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Iliinois, have invented new and useful Improvements in Burglar-Alarms, of which the following is a specification.

This invention is a combined door and window lock and burglar-alarm of that kind wherein a cap is exploded by an attempt to open adoor or window.

Novelty is claimed with respect to the construction of the device, as more fully hereinafter described.

ln the accompanying drawings, Figure 1 is a side elevation of the device illustrated as applied to a window-sash. Fig. 2 is a plan view. Fig. 3 is an edge view. Fig. 4 is a section on the line 4 4 of Fig. 2.

Referring specifically to the drawings, 6 indicates a plate of sheet metal cut to proper size and having a hole 7 to receive a screw by which the device may be attached to a door or window-sash. This plate is hinged, as at 8, to a plate 9, upon which is another plate 10, these plates being slidable lengthwise with respect to each other. At the end opposite the hinge the plate 10 projects beyond the plate 9 and has teeth 11. A portion of the plate 9 is struck up to form an ear 12, which projects through aslot 13 in the plate 10.

14 indicates a cup or anvil adapted to receive a paper explosive-cap, and this cup forms the head of a stud 15, which is riveted to the pate 9. The stud extends through a slot 16 in the plate 10, and the slots 16 and 13 permit a limited lengthwise movement of the plate 10 upon and with respect to the plate 9.

17 indicates a hammer which is forked at one end to span the ear 13, to which it is pivoted by a pin 18. The end of the hammerpiece adjacent or under the pivot issquared, as at 17 1, and the head or other end is properly formed to strike a cap in the cup 14. A

' spring 19, coiled around the pivot 18 and bearing between the hammer and the plate 10, furnishes the power to'strike the hammer.

In operationas, for example, in connection with a window, as shown in Fig. l-the plate 6 is screwed to the top of the lower sash and the hammer is set or cocked by sliding the plate 10 outwardly to bring the end or edge of the slot 13 under the squared portion 17 of the lifted hammer. This prevents the hammer from striking. The teeth 11 are then rested against the stile of the upper sash. If the upper sash be lowered or the lower sash raised, the effect is to engage the teeth and cause the plate 10 to slide back and down until the slot 13 passes beyond the edge of the end 17 a of the hammer, whereupon the spring throws the hammer down, causing it to strike and explode the cap in the cup, and the engagement of the plates between the sashes forms a lock which prevents the further movement of either sash.

The device may be applied to doors by attaching the plate 6 to the floor or to the doorjamb with the toothed plate resting against the door.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination with a plate 9 having an ear and cupped stud projecting therefrom, of a toothed plate v10 having slots through which the bar and stud project, said plates being slidable with respect to each other, and a spring-actuated hammer pivoted to the car and arranged to strike in the cup and having a portion arranged to engage upon the plate 10 at the edge of the slot through which the ear extends, when the hammer is cocked.

2. The combination with the plate 8 having means to fasten the same in iixed position, and the plate 9 hinged thereto and having a projecting ear and cupped stud, of the toothed plate 10 slidable on the plate 9 and havingy slots through which the ear and stud project, and a hammer pivoted to the ear and tripped by the plate 10 and arranged to strike in the cup.

In testimony whereof I have signed my name to this specification inthe presence of two subscribing witnesses.

OLE B. HANSON.

Witnesses ELSA PRoscHE, SIGNA FELTsxoe. 

